/* replaygain_synthesis - Routines for applying ReplayGain to a signal
 * Copyright (C) 2002,2003,2004,2005,2006,2007  Josh Coalson
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H
#define FLAC__SHARE__REPLAYGAIN_SYNTHESIS_H

#include <stdlib.h> /* for size_t */
#include "FLAC/ordinals.h"

#define FLAC_SHARE__MAX_SUPPORTED_CHANNELS 2

typedef enum
{
    NOISE_SHAPING_NONE = 0,
    NOISE_SHAPING_LOW = 1,
    NOISE_SHAPING_MEDIUM = 2,
    NOISE_SHAPING_HIGH = 3
} NoiseShaping;

typedef struct
{
    const float* FilterCoeff;
    FLAC__uint64 Mask;
    double Add;
    float Dither;
    float ErrorHistory[FLAC_SHARE__MAX_SUPPORTED_CHANNELS][16];                /* 16th order Noise shaping */
    float DitherHistory[FLAC_SHARE__MAX_SUPPORTED_CHANNELS][16];
    int LastRandomNumber[FLAC_SHARE__MAX_SUPPORTED_CHANNELS];
    unsigned LastHistoryIndex;
    NoiseShaping ShapingType;
} DitherContext;

void FLAC__replaygain_synthesis__init_dither_context(DitherContext* dither, int bits, int shapingtype);

/* scale = (float) pow(10., (double)replaygain * 0.05); */
size_t FLAC__replaygain_synthesis__apply_gain(FLAC__byte* data_out, FLAC__bool little_endian_data_out, FLAC__bool unsigned_data_out, const FLAC__int32* const input[], unsigned wide_samples, unsigned channels, const unsigned source_bps, const unsigned target_bps, const double scale, const FLAC__bool hard_limit, FLAC__bool do_dithering, DitherContext* dither_context);

#endif